摘要
网格环境中提供大量不同QoS保证的服务,如何选择可靠的服务成为一个关键问题。本文提出以服务提供的质量属性为参考对象建立直接信任模型的方法,并在建立过程中引入偏序关系以达到屏蔽一些没有价值的参考历史纪录的目的;同时参考人类社会行为规律建立推荐信任模型,以及借鉴人类竞赛的打分机制,通过比较每个推荐信任度方差的方法屏蔽恶意推荐信息。最后针对采用本模型进行服务选择时产生的负载不均衡的现象,提出采用轮盘赌的方法进行服务选择。实验证明,本模型可以有效地解决网格环境中的信任问题。
In grid environment grid nodes provide services with QoS guarantee,so how to choose a credible service is a critical problem.This paper proposes a kind of mechanism to construct direct trust model based on QoS constraints that the services provide,and in the process of building the direct trust a partial relation is inducted in order to retain the worthy history information.And referring to behavior of human society the reputation model of the grid nodes is established.Moreover,by virtual of the mechanism of the grading in the match the malice recommendation information is shielded through comparing the difference of each recommendation.In order to avoid the overload appearance,a choosing scheme implementing a biased roulette wheel is adopted.Simulation tests prove that the model can tackle the trust problem in a simple and efficient way.
出处
《计算机与现代化》
2010年第4期85-90,共6页
Computer and Modernization
